Machine for forming sheet-metal tubes.



Patented May 22, 1900.

A. SCHWABTZBAUER; MACHINE FOR FOBIMNG SHEEI METAL TUBES.

(Application filed Feb. 28, 1900.)

3 Sheets-Sheet I No. 649,996. Patented May 22, 1900.

A. SCHWARTZBAUEB.

MACHINE FOR FORMING SHEET METAL TUBES.

\ (Application filed Feb. 26, 1900.) (No Model.) 7 3 Sheets-Sheet 2.

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MACHINE FOR FORMING SHEET METAL TUBES.

(Application filed Feb, 28, 1900.)

(No Model.) 3 Sheets-Sheet 3.

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' UNITED STATES PATENT we.

ANTONSCHVVARTZBAUER, OF PHILADELPHIA, PENNSYLVANIA.

MACHINE FOR FORMING SHEET-METAL TUBES.

SPECIFICATION forming part of Letters Patent NO. 649,996, dated May 22,1900.

Application filed February 28, 1900. Serial No. 6,787. (No model.)

To all whom it may concern: r 7

Be it known that I, ANTON SCHWARTZ- BAUER, a citizen of the UnitedStates,residing at No. 1838 South Fifth street, in the city ofPhiladelphia, in the county of Philadelphia and State of Pennsylvania,have invented certain new and usefulImprovements in Machines for FormingSheet-Metal Tubes, of which the following is a specification.

My invention has relation to a machine for forming sheet-metal tubing,and in such connection it relates to the construction and arrangement ofsuch a machine.

The principal object of myinvention is to provide a machine wherebysheet-metal tubing, whether of cylindrical or tapered form, may beeasily and quickly made; and to that end my invention consists,essentially, of a machine provided with mechanism for lapping the edgesof lthe sheet metal to form a locking means for the tube, mechanism forbending the lapped-edged sheet into the tubular form required, andmechanism for finishing the bent tube.

My invention further consists of a machine for making sheet-metal tubingwhen constructed and arranged in substantially the manner hereinafterdescribed and claimed.

The nature and scope of my present invention will be more fullyunderstood from the following description, taken in connection with theaccompanying drawings, forming part hereof, in which Figure 1 is aperspective view of a machine embodying main features of my invention.

Fig. 2 is an end elevational view of the righthand end of the machine.Fig. 3 is a longitudinal sectional View of Fig. 1. Fig. 4 is an enlargedlongitudinal sectional view illustrating in detail the mechanism forlapping the edges of the sheet. Fig. 5 is a similar 'view illustratingin detail the mechanism for bending the lapped sheet into substantiallytubu- Fig. 6 is an enlarged view of Fig. 3, illustrating the means foradjusting the guide bar or plate. Figs. 7, 8, and 9 are perspectiveviews of respectively the sheet, the partly-formed tube, and the formedtube of cylindrical shape; and Figs. 10 and 11 are perspective views ofrespectively a sheet and a tapered tube formed therefrom.

Rcferrin g to the drawings, a represents the supports, and ctthebed-plate, of the machine. At the left-hand end of the machine is hingeda brake or folding bar {1), and on the bedplate a, immediately in frontof the folding' bar 1), is located a die-plate d. The die-plate d has abeveled edge d, which is separated from or raised above the bed-plate bymeans of a removable gage-plate 01 In the space d thus formed the edgeof the sheet A is adapted to be inserted, as clearly illustrated in Fig.4. It will be readily understood that the depth of the space 01 willdepend upon the thickness of the gage-plate 0F, and hence by interposingplates 01 of varying thickness between the die-plate d and the bed a ofthe machine the space at may be regulated to accommodate sheets ofvarying thickness of metal. The beveled edge d projects beyond the frontedge of the gage-plate d to a distance corresponding with the width ofthe lap required, and to permit of the variation in this width of lapthe gage-plate d is made adjustable between the bed of the machine andthe die-plate d by slotting the plate d as at C1 and passing set orfastening screws d through these slots and through the die-plate d andinto the bed-plate a. After the sheet A has been provided at twoopposite edges with a lap the sheet is then bent into required form bythe bending mechanism. This mechanism is arranged at the other end ofthe table, and consists of a round bar or mandrel 6; one end of which ispivoted, as at e, in a projecting bracket 6 extending from the side ofthe bed-plate a. The other end of the mandrel e is adapted to enter abracket 6 and to be locked therein by a bolt e as clearly illustrated inFigs. 1 and 2. Adjacent to that edge of the table at which the mandrel Zis located is arranged a bending-frame consisting of two or more pivotedarms f, the lower ends of which are curved, as at f to fitconcentrically over the bar or mandrel'e. These arms f carry a fiatstrip f and have at their upper end a common handle f Below the mandrellis located a gage-plate g, upon which the lapped edge of the sheet isadapted to rest and also upon which the lapped edge is guided. Thisgage-plate g is united to the side of the machine by preferably twobolts g, each passing through a slot 9 in the side of the machine andarranged in such a manner as that the and upon the bedthe'r'eofarere'movably 'secured the finishing mandrels orformers m and n,- ofwhich mis substantially cylindrical- The operation'of the machinehereinbefore Q upper edge of the plate 9 may either rest parallel withthe mandrel e or'be turned so that it shall rest at an oblique angle toeither, end of said mandrel. When tilted to its oblique position, thegage-plate g is adapted to be locked by means of a peg passed through,either the opening 9 or 9 arranged ateither end of the gage-plate g andadapted, respectively, to register when that end is tilted 'up-j' wardwith a similar'opening in the side of the machine. 7

At the front and. rear sides .of the machine throughout its length,while the mandrel n is tapered. 3

explained is "as follows: The opposite sides ofthersheet A'are firstformed with the laps A and Afladapted when the sheet is bent around tointerlock, as illustated in Figs. 9 andli. When a eylindrical orstraight tube isto be formed, the sheet A is oblong, as illustrated 'in-Fig. 7, but when the tube is ,to be of tapered form the sheet is 0f theform' illustrated in Fig. 10. After the lapsA' and A have been:formed'by the brake b, as previously explained, the sheet is removed tothe bending mechanism. In this portion of the-machine the "lapped edge Ais first inserted between the mandrel e and the side of I the machineuntil it rests on the gage-plate g. l'lvhe arms f-and strip f are thenmoved downward from a vertical to a horizontal position and the sheet ispartly-bent or curved,- as illustrated in Fig. 5, being forced down uponthe curved mandrel 'by the curved portions of-thearms f and spreadelosely over thet-mandrel by-the lower edge of the strip f Thepartly-bent sheet" is then removed from the mandrel e by swinging themandrel andsheet away from the side of the tube.

Theiotherllapped edge A is next inserted betweenthe mandrel e and theside of the table cisely the same, as above explained, but thegage-plate, 9 must be tilted after each bendin g operation toan'opp'ositeinclined position. Havingthus described the nature andobject of my invention, what Iclaim as new, and

desire to secure by-Letters Patent,"is-- 1; In a machine of thecharacter described, a bendingmeeh'anism, comprising abendingframehinged at its .lowerend to the bed of the machine and curved at thatpoint, a flat strip located adjacent to and above thecurved portion ofsaid frame, a mandrel pivoted at oneendof the machine adjacentto thebending-frame, means for locking the other end of said mandrel to theend of the machine and a gage-plate located'between said frame andmandrel and below the same, substantially as and for the purposesdescribed.

' 2. Ina machine of the characterdescribed, in combination with abending-frame, a mandrel pivoted atone end of the machine ad- 'jacent toone end of said frame, means for lockingth'e other end of said mandrelso that said mandrel shall rest parallel with said frame, a gage-platelocated below the mandrel,---and' means for tilting said gage-plateobliquely to either end of said mandrel,fsubstantially as and for thepurposes described. In testimony whereof I have hereunto set mysignaturein the presenceof twosubscribing witnesses. V

v ANTON SCI-IWARTZBAUER. Witnesses:

J. WALTER DOUGLASS,

THOMAS M. SMITH.

